package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.equals(end.plusDays(1))) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }

        List<Double> turnoverList = new ArrayList<>();

        for (LocalDate date : dateList) {//5:1 00:00:00
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            //查询指定日期的营业额
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();

    }

    /**
     * 统计指定时间区间内的用户数量(总用户量、新增用户量)
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.equals(end.plusDays(1))) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }

        List<Integer> totalUserList = new ArrayList<>();
        List<Integer> newUserList = new ArrayList<>();

        for (LocalDate date : dateList) {//5-1
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);

            //SQL: select count(id) from user where create_time > begin and create_time < end ----新增用户数量
            //SQL: select count(id) from user where  create_time < end ----总用户数量
            Map map = new HashMap();
            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);//总用户数量

            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);//新增用户数量

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数量
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.equals(end.plusDays(1))) {
            dateList.add(begin);
            begin = begin.plusDays(1);
        }

        List<Integer> totalOrderList = new ArrayList<>();
        List<Integer> validOrderList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            //SQL: select count(id) from orders where order_time >= begin and order_time <= end ---某天的订单总数
            //SQL: select count(id) from orders where order_time >= begin and order_time <= end and status = 5 ---某天的有效订单总数

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            //查询某天的订单总数
            Integer totalOrder = orderMapper.countByMap(map);

            map.put("status", Orders.COMPLETED);
            //查询某天的有效订单数
            Integer validOrder = orderMapper.countByMap(map);

            totalOrderList.add(totalOrder);
            validOrderList.add(validOrder);
        }

        //时间区间内的订单总数
        Integer totalOrderCount = totalOrderList.stream().reduce(Integer::sum).get();
        //时间区间内的有效订单总数
        Integer validOrderCount = validOrderList.stream().reduce(Integer::sum).get();


        Double orderCompletionRate = 0.0;
        if (totalOrderCount > 0) {
            //订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(totalOrderList, ","))
                .validOrderCountList(StringUtils.join(validOrderList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计指定时间区间内的销量排名数据 top10
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10Statistics(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        //统计销量数据
        List<GoodsSalesDTO> list = orderMapper.getTop10(beginTime, endTime);

        List<String> nameList = list.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numberList = list.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList, ","))
                .numberList(StringUtils.join(numberList, ","))
                .build();
    }

    /**
     * 导出运营数据Excel报表
     */
    @Override
    public void exportXlsx(HttpServletResponse response) {
        LocalDate beginDate = LocalDate.now().minusDays(30);
        LocalDate endDate = LocalDate.now().minusDays(1);

        //查询数据库，准备数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(beginDate, LocalTime.MIN), LocalDateTime.of(endDate, LocalTime.MAX));

        //通过poi操作Excel
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template\\运营数据报表模板.xlsx");//从类路径下加载文件，返回文件的输入流
        try {
            //从已有Excel文件加载
            XSSFWorkbook excel = new XSSFWorkbook(in);

            XSSFSheet sheet = excel.getSheetAt(0);
            XSSFRow row = sheet.getRow(1);
            XSSFCell cell = row.getCell(1);

            cell.setCellValue(beginDate + "至" + endDate);

            //填充概览数据
            row = sheet.getRow(3);
            cell = row.getCell(2);
            cell.setCellValue(businessData.getTurnover());

            cell = row.getCell(4);
            cell.setCellValue(businessData.getOrderCompletionRate());

            cell = row.getCell(6);
            cell.setCellValue(businessData.getNewUsers());

            row = sheet.getRow(4);
            cell = row.getCell(2);
            cell.setCellValue(businessData.getValidOrderCount());

            cell = row.getCell(4);
            cell.setCellValue(businessData.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                row = sheet.getRow(i + 7);
                LocalDate date = beginDate.plusDays(i);
                row.getCell(1).setCellValue(date.toString());

                BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row.getCell(2).setCellValue(businessDataVO.getTurnover());
                row.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            }

            //通过输出流将Excel文件下载到浏览器---输出流
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            out.flush();
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
